<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>isnan</title>
  </head>
  <body bgcolor="#FFFFFF">
    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>isnan</b> -   check for "Not a Number" entries</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>r=isnan(x)  </tt>
      </dd>
    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>x</b>
        </tt>: real or complex vector or  matrix r : boolean vector or matrix</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
      <tt>
        <b>isnan(x)</b>
      </tt> returns a boolean vector or matrix which contains true
    entries corresponding with "Not a Number" <tt>
        <b>x</b>
      </tt> entries and false entries
    corresponding with regular <tt>
        <b>x</b>
      </tt> entries.</p>
    <h3>
      <font color="blue">Examples</font>
    </h3>
    <pre>

isnan([1 0.01 -%nan %inf-%inf])
 
  </pre>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="isinf.htm">
        <tt>
          <b>isinf</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
  </body>
</html>
